package com.study.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.SocketAddress;

/**
 * 创建自定义助手类
 */
public class CustomHandler extends SimpleChannelInboundHandler<HttpObject> {
    //SimpleChannelInboundHandler : 对于请求来讲,其实相当于[入站,入境]
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject httpObject) throws Exception {
        // 获取channel
        Channel channel = channelHandlerContext.channel();
        //客户端地址
        SocketAddress socketAddress = channel.remoteAddress();
        if (httpObject instanceof HttpRequest)
            System.out.println(socketAddress);

        //定义发送的消息
        ByteBuf content = Unpooled.copiedBuffer("Hello Netty~", CharsetUtil.UTF_8);

        //构建一个httpresponse
        FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
        //为响应添加数据类型和长度
        response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
        response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());

        //把响应刷到客户端
        channelHandlerContext.writeAndFlush(response);
    }

    //以下方法是channel的生命周期

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 注册...");
        super.channelRegistered(ctx);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 活动中...");
        super.channelActive(ctx);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 失活...");
        super.channelInactive(ctx);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 读取完成...");
        super.channelReadComplete(ctx);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        System.out.println("channel 触发用户事件...");
        super.userEventTriggered(ctx, evt);
    }

    @Override
    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 可写事件触发...");
        super.channelWritabilityChanged(ctx);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("channel 异常捕获...");
        super.exceptionCaught(ctx, cause);
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 助手类添加...");
        super.handlerAdded(ctx);
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 助手类移除...");
        super.handlerRemoved(ctx);
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 移除...");
        super.channelUnregistered(ctx);
    }

}
